The phrase "a solid improvement" is correct and usable in written English.
It can be used to describe a noticeable and substantial enhancement or progress in a particular area or situation.
Example: "After implementing the new training program, we saw a solid improvement in employee performance."
Alternatives: "a significant enhancement" or "a marked progress."
That was a solid improvement on the 0.4 percent growth recorded in the fourth quarter.
Annalisa Piazza said: Today's report is encouraging as it marks a solid improvement in the labour market.
There has been a solid improvement in credit quality: Half as many issues were downgraded in 1997 as in 1996.
There was a solid improvement in retail sales in April after horrid weather impacted the March number.
While that represents a solid improvement over the 11.6 million vehicles sold in 2010, it is not yet the recovery the industry had hoped for.
Mr. Dion predicted a solid improvement in retail operations this year, largely because several Fidelity growth funds outperformed the market last year and this should attract new customers and increase investments from existing ones.
With a few solid improvements to the attention they receive from their manager and the company looking out for them, most could be swayed to the positive side.
The dollar hit multi-month highs against the euro and the yen Tuesday, aided by a manufacturing report Monday that stoked speculation a forthcoming U.S. jobs report would show solid improvement.
For the shorter term, though, they may regret that they bet so much and borrowed so much not on a solid, plausible improvement, but on a miracle that now turns out not to have happened.
"There has not been a solid, steady improvement," Brey said.
But she proudly lists recent achievements: a huge increase in the proportion of children who are vaccinated, a balanced budget, many more certified teachers and solid improvement in standardized tests, even if the scores remain unimpressive.
